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Title: Study of indices for drought characterization in KBK districts in Orissa (India)
Authors: Pandey R.P.
Dash B.B.
Mishra, Surendra Kumar
Singh R.
Published in: Hydrological Processes
Abstract: Drought is a temporary, random and regional climatic phenomenon, originating due to lack of precipitation leading to water deficit and causing economic loss. Success in drought alleviation depends on how well droughts are defined and their severity quantified. A quantitative definition identifies the beginning, end, spatial extent and the severity of drought. Among the available indices, no single index is capable of fully describing all the physical characteristics of drought. Therefore, in most cases it is useful and necessary to consider several indices, examine their sensitivity and accuracy, and investigate for correlation among them. In this study, the geographical information system-based Spatial and Time Series Information Modeling (SPATSIM) and Daily Water Resources Assessment Modeling (DWRAM) software were used for drought analysis on monthly and daily bases respectively and its spatial distribution in both dry and wet years. SPATSIM utilizes standardized precipitation index (SPI), effective drought index (EDI), deciles index and departure from long-term mean and median; and DWRAM employs only EDI. The analysis of data from the Kalahandi and Nuapada districts of Orissa (India) revealed that (a) droughts in this region occurred with a frequency of once in every 3 to 4 years, (b) droughts occurred in the year when the ratio of annual rainfall to potential evapotranspiration (Pae/PET) was less than 0.6, (c) EDI better represented the droughts in the area than any other index; (d) all SPI, EDI and annual deviation from the mean showed a similar trend of drought severity. The comparison of all indices and results of analysis led to several useful and pragmatic inferences in understanding the drought attributes of the study area. Copyright © 2007 John Wiley & Sons, Ltd.
Citation: Hydrological Processes (2008), 22(12): 1895-1907
Issue Date: 2008
Keywords: Decile index
Drought duration
Drought indices
Drought severity
Drought vulnerability
Effective drought index
Standardized precipitation index
ISSN: 8856087
Author Scopus IDs: 7401527632
Author Affiliations: Pandey, R.P., National Institute of Hydrology, Roorkee-247 667 UA, India
Dash, B.B., Office of the Engineer-in-Chief (WR), Department of Irrigation, Government of Orissa, Bhubaneshwar, Orissa, India
Mishra, S.K., Department of Water Resources Development and Management, Indian Institute of Technology, Roorkee-247 667 UA, India
Singh, R., Department of Hydrology, Indian Institute of Technology, Roorkee-247 667 UA, India
Corresponding Author: Pandey, R.P.; National Institute of Hydrology, Roorkee-247 667 UA, India; email:
Appears in Collections:Journal Publications [WR]

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